Execute Several Queries at once in one connection

I would like to Execute serveral queries at once and don't know how to do it

my code is like this:

var AConnection, Driver;

AConnection = ADO.CreateADOConnection();

AConnection.ConnectionString = "Provider=MSDAORA.1;Password=xHl4C06T;User ID=chapar941_Auto;Data Source=srv28;Persist Security Info=True";

AConnection.LoginPrompt = false;

AConnection.Open();

var Driver = DDT.ExcelDriver("C:\\Add-EventTypes.xls", "Sheet1");

var k = aqConvert.VarToStr(Driver.Value(0));

var str = "delete from template where template.et_id in(select id from eventtype where name like '"+k+"');delete from predefined_template where predefined_template.et_id in(select id from eventtype where name like '"+k+"');delete from eventtype where name like '"+k+"'";

// AConnection.Execute(str,1,128);

DDT.CloseDriver(Driver.Name);

AConnection.Close();